Synopsis

Kyodo Nanami, a senior to the Detective Boys, extends an invitation to a treasure hunt at her home. Upon arrival, the boys learn the prize is likely concealed within the Dark Tower. Yet, the tower presents an impenetrable facade, devoid of doors or windows. As they explore the estate, they uncover a network of elaborate mechanisms and hidden traps. Soon after, Nanami's mother, Kyodo Momoe, is found deceased, seemingly having fallen from the tower. While investigating these perplexing events, Hai